Experimenting with boosters is like experimenting with head porting. If you don't have a flow bench and some other data gathering tools then you are probably wasting your time. You'll need some way of knowing if you are making things better or worse. You can't just look at it and tell if you improved anything.

Vizard has some stuff in his books on booster design. He shows some tricks on booster porting and booster placement. His goal was to increase total airflow while keeping a good booster signal.

As for me, I'm spending most of my time these days learning EFI so I'm gradually selling off my carbs and slowing forgetting what I used to know.